feeble in WordNet English dictionary

1. lacking bodily or muscular strength or vitality
   "a feeble old woman"; "her body looked sapless"
   decrepit  debile  feeble  infirm  rickety  sapless  weak  weakly 
   
2. lacking strength or vigor
   "damning with faint praise"; "faint resistance"; "feeble efforts"; "a feeble voice"
   faint  feeble 
   
3. lacking strength
   "a weak, nerveless fool, devoid of energy and promptitude"- Nathaniel Hawthorne
   feeble  nerveless 
   
4. pathetically lacking in force or effectiveness
   "a feeble excuse"; "a lame argument"
   feeble  lame